main/iproute2: fix LIBDIR for tc plugins
default tc LIBDIR is /usr/lib and not /lib, by removing LIBDIR from make invocation in APKBUILD build function package functions put tc helper in /usr/lib, and then 'tc' can find them fixes: #6948 (closed)
default tc LIBDIR is /usr/lib and not /lib, by removing LIBDIR from make invocation in APKBUILD build function package functions put tc helper in /usr/lib, and then 'tc' can find them fixes: #6948 (closed)